Down the dark ally, the gangsters corner the hero against the brick wall. He's a goner, boys - but, wait, is that a switchblade? The light reflects off the metal for half a second before it snaps out and stabs one of the bad guys. Switchblades are knives that automatically unfold the blade. They are also known as automatic knives. They contain a spring that forces the blade out quickly. So - why are switchblades illegal?
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